3 files changed, 39 insertions, 0 deletions
diff --git a/include/kernel/serial.h b/include/kernel/serial.h
index dbfa7f2..6ac5d65 100644
--- a/include/kernel/serial.h
+++ b/include/kernel/serial.h
@@ -1,10 +1,15 @@
 #ifndef _SERIAL_H
 #define _SERIAL_H
 
+#include <kernel/tty.h>
 #include <sys/types.h>
 
+extern struct tty_struct tty_rs;
+
 int rsputs(char*);
 
 ssize_t rsread(void*, size_t);
 
+void serial_init(void);
+
 #endif
diff --git a/include/kernel/tty.h b/include/kernel/tty.h
new file mode 100644
index 0000000..b3f3012
--- /dev/null
+++ b/include/kernel/tty.h
@@ -0,0 +1,26 @@
+#ifndef _TTY_H
+#define _TTY_H
+
+#include <kernel/sched.h>
+#include <sys/types.h>
+
+#define TTY_BUF_SIZE 1024
+
+struct tty_queue {
+  unsigned pread;
+  unsigned pwrite;
+  struct task_struct *waiting;
+  char buf[TTY_BUF_SIZE];
+};
+
+struct tty_struct {
+  void (*init) (void);
+  struct tty_queue rqueue;
+  struct tty_queue wqueue;
+};
+
+ssize_t tty_read(unsigned, void*, size_t);
+
+void tty_init(void);
+
+#endif
diff --git a/include/limits.h b/include/limits.h
new file mode 100644
index 0000000..c2c9cc5
--- /dev/null
+++ b/include/limits.h
@@ -0,0 +1,8 @@
+#ifndef _LIMITS_H
+#define _LIMITS_H
+
+#include <sys/types.h>
+
+#define SSIZE_MAX ((size_t) ~((size_t) 1 << (sizeof(size_t) * 8 - 1)))
+
+#endif